JPS6132105B2 - - Google Patents
Info
- Publication number
- JPS6132105B2 JPS6132105B2 JP53114986A JP11498678A JPS6132105B2 JP S6132105 B2 JPS6132105 B2 JP S6132105B2 JP 53114986 A JP53114986 A JP 53114986A JP 11498678 A JP11498678 A JP 11498678A JP S6132105 B2 JPS6132105 B2 JP S6132105B2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- mold
- charge
- slab
- molten steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 239000010959 steel Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/08—Accessories for starting the casting procedure
- B22D11/086—Means for connecting cast ingots of different sizes or compositions
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】
この発明は連続鋳造において、前のチヤージの
最後の溶鋼が未だ鋳型内にある間に、その上に後
のチヤージの溶鋼を継足して鋳込み、連続して鋳
片を引出す連続鋳造方法に関する。Detailed Description of the Invention In continuous casting, the present invention involves adding molten steel from a subsequent charge onto the last molten steel from a previous charge while it is still in the mold, and continuously casting slabs. Concerning a continuous casting method for drawing.
このように、前後のチヤージの鋳片を接続して
引出す方法は、連続鋳造の優れた作業性を一層向
上するものとして注目されているが、従来は後の
チヤージの鋳込開始のわずかな遅れ等で鋳型内の
前のチヤージの湯面が凝固し、鋳片継足し部分の
接続が不完全となり切損ブレイクアウト等の事故
を生じる危険が多く、また違つた鋼種の継足し連
続鋳造では、前のチヤージの溶鋼表面が未凝固の
うちに後の溶鋼が鋳込まれるので、湯境付近の鋳
片に成分の混合が生じ、引抜後に前後各1m程は
切捨のクロツプとなる等の不経済な点が残されて
いた。 In this way, the method of connecting and drawing slabs from the front and rear charges is attracting attention as a method that further improves the excellent workability of continuous casting. etc., the molten metal surface of the previous charge in the mold solidifies, and the connection of the slab joining part becomes incomplete, leading to many accidents such as breakage and breakout. Since the subsequent molten steel is poured while the surface of the molten steel from the previous charge is not solidified, the components of the slab near the melting point are mixed, resulting in defects such as cropping of about 1m in front and back after drawing. The economic point remained.
出願人工場では先に連続鋳造において、鋳型内
の前のチヤージに湯面にその鋳片巾に略々等しい
長さの鋼パイプを直径の略々半が湯面下に没する
ように横置し、その上に後のチヤージの溶鋼を鋳
込み前記鋼パイプを鋳ぐるむ恰好で前後接続する
方法により湯境部前後鋳片の成分混合を回避する
と共に安全な継足し連続鋳造に成功しているが、
本発明の方法はこれとは異なり、鋳型内で前のチ
ヤージの湯面を積極面に凝固せしめ、その鋳片の
上に後のチヤージの溶鋼を鋳込むことによつて成
分の混合を可及的に避け、継足し湯境付近の切捨
部を少くして歩留り向上をはかるようにした点、
ならびに鋳片巾方向に適当間隔をおいて環状の継
ぎ治具を配置して鋳ぐるみ、これによつて前のチ
ヤージの鋳片と後のチヤージの鋳片とが恰もダミ
ーバーヘツドと鋳片が結合具で強固に連結される
如くに接続して引出すよう構成し、継足し連続鋳
造片の引抜に伴う切損、ブレイクアウト事故が回
避されるようにした点を特徴とする。 At the applicant's factory, during continuous casting, a steel pipe with a length approximately equal to the width of the slab was placed horizontally on the front charge of the mold so that approximately half of its diameter was submerged below the molten metal surface. However, by pouring molten steel from the subsequent charge onto the molten steel and connecting the steel pipes back and forth in a way that surrounds them, mixing of the components of the slabs before and after the melting area can be avoided, and safe continuous continuous casting has been achieved.
The method of the present invention is different from this, in that the molten steel from the previous charge is positively solidified in the mold, and the molten steel from the subsequent charge is poured onto the slab, thereby making it possible to mix the components. In order to improve the yield by reducing the truncation area near the boundary between adding and adding hot water,
In addition, annular joining jigs are placed at appropriate intervals in the width direction of the slab to form the casting, and this allows the slab from the previous charge and the slab from the subsequent charge to join together to the dummy bar head and the slab. It is characterized in that it is constructed so that it can be connected and pulled out so as to be firmly connected with a tool, so that breakage and breakout accidents caused by pulling out the supplementary continuous cast piece are avoided.
以下本発明の方法を図面を参照し、工程に従つ
て詳細説明する。 Hereinafter, the method of the present invention will be explained in detail step by step with reference to the drawings.
前のチヤージの溶鋼の鋳込を停止し浸漬ノズ
ルを引上げ、タンデイツシユカーを鋳型上から
退避させる。 Stop pouring the molten steel from the previous charge, pull up the immersion nozzle, and evacuate the tundish car from above the mold.
湯面上のパウダーは溶鋼表面に皮張りを生ぜ
しめない程度に除去する(第1図イおよび
ロ)。 Powder on the surface of the molten metal is removed to the extent that it does not form a skin on the surface of the molten steel (Figure 1 A and B).
環状の継ぎ治具3を複数個、鋳型の巾方向へ
それらの環軸を揃え適当間隔ををおいて、環の
縦の径ldの略々半が湯面下に没するよう配置
し、湯面に冷剤5を投入して表面を完全に凝固
させる(第2図、イおよびロ)。 A plurality of annular joining jigs 3 are arranged with their ring axes aligned in the width direction of the mold and spaced apart at appropriate intervals so that approximately half of the vertical diameter ld of the rings is submerged below the molten metal surface. Coolant 5 is poured onto the surface to completely solidify the surface (Figure 2, A and B).
上記の環状継ぎ治具3は、例えば第5図に示す
楕円形あるいは第6図に示す眼鏡形、連円形その
他の横に短径sd、縦に長径ldをもつ異形環とし、
実施例では強度を考慮して巾1800mm、厚200mmの
スラブの場合、環の短径130mm、長径260mm巾130
mm、肉厚15〜20mmの楕円形環を鋳片巾方向へ間隔
をおいて2個1組として使用した。 The above-mentioned annular joint jig 3 is, for example, an oval shape as shown in FIG. 5, a spectacle shape as shown in FIG.
In the example, considering strength, in the case of a slab with a width of 1800 mm and a thickness of 200 mm, the short axis of the ring is 130 mm, the long axis is 260 mm, and the width is 130 mm.
A set of two oval rings with a wall thickness of 15 to 20 mm were used at intervals in the slab width direction.
鋳型内の湯面が鋳型上縁から適当位置(例え
ば270mm下)となるよう鋳片を引出す。これは
後のチヤージの溶鋼の継足し鋳込を開始するた
めであるが、その際、湯面の下げ過ぎによる鋳
型底部からのシール洩れが生じないよう注意す
る(第3図イおよびロ)。 Pull out the slab so that the molten metal level in the mold is at an appropriate position (for example, 270 mm below the upper edge of the mold). This is to start additional casting of molten steel in the subsequent charge, but at this time, care must be taken not to cause seal leakage from the bottom of the mold due to lowering the molten metal level too much (Fig. 3 A and B).
後のチヤージのタンデイツシユカーを鋳型上
への移動させ、浸漬ノズル6を前のチヤージの
湯面上方適当位置まで下げ、鋳込を開始する。 The tundish car of the second charge is moved onto the mold, the immersion nozzle 6 is lowered to an appropriate position above the hot water level of the previous charge, and casting is started.
鋳込開始後も鋳片は暫時(約40秒)そのまま
保持し、しかる後、引抜を再開する(第4図イ
およびロ)。 After the start of casting, the slab is held as it is for a while (about 40 seconds), and then drawing is resumed (Fig. 4 A and B).
以上、前のチヤージの鋳込を停止してから後の
チヤージの鋳込を開始し鋳片の引抜を再開する迄
の所要時間は略々3分である。 As described above, the time required from stopping the casting of the previous charge to starting the casting of the next charge and restarting the drawing of the slab is approximately 3 minutes.
本発明の方法によると、前のチヤージの溶鋼の
上面が完全に凝固してから後のチヤージの溶鋼を
その上に鋳込むのであるから、前のチヤージと後
のチヤージが鋼種を異にする場合も、鋼成分の混
合が殆んど生じない。 According to the method of the present invention, the upper surface of the molten steel of the previous charge is completely solidified before the molten steel of the next charge is poured onto it, so even if the previous charge and the subsequent charge are of different steel types. Also, almost no mixing of steel components occurs.
第7図は上記の如くにして前のチヤージの上に
後のチヤージの異鋼種を継足し連続鋳造した供試
鋳片(タンデイツシユ交換所要時間3分)につい
て、継足し湯境近辺の成分の混合状況を調べるた
め、湯境からの各距離位置におけるMnとNbの分
析値をグラフ図示したもので、分析は鋳片巾中央
線上、サイドから10mmおよび中心から10mm点の通
る垂直線上で、同図に示す湯境からの各距離位置
より採取した切粉により行つた。図中、黒点と破
線は上記サイド側、白点と実線は中心側である。 Figure 7 shows the mixing state of the components near the replenishment boundary for a test slab (3 minutes required for tundish exchange) that was continuously cast by adding a different steel type from the subsequent charge onto the previous charge as described above. In order to investigate this, the analytical values of Mn and Nb at various distances from the melting point are shown in a graph. This was done using chips collected from various distances from the hot water boundary as shown. In the figure, black dots and broken lines are on the side, and white dots and solid lines are on the center side.
また本発明の方法によると前のチヤージの溶鋼
上面に、前記凝固よつて環状の継ぎ治具を固着
し、その上に該継ぎ治具の露出部を鋳ぐるむよう
に後のチヤージの溶鋼を鋳込むのであるから、恰
も継ぎ治具を備えたダミーバーヘツドとその上に
鋳込まれた鋳片の如く確実な接続が得られ、鋳片
の引抜に際して、切損、ブレイクアウト等の事故
を生じる惧がなく安全に作業することができる。
従来の中継ぎでは前のチヤージの溶鋼上面が凝固
しないうちに後のチヤージの溶鋼を鋳込む必要が
あつたから、後のチヤージのタンデイツシユノズ
ルの開孔に手間どる等の作業遅れがブレイクアウ
ト等の誘因となる危険があつたが、本法では上記
に明かなようにこの虞れがなく、安全に作業を継
続することができる。 Further, according to the method of the present invention, the solidified annular splicing jig is fixed to the upper surface of the molten steel of the previous charge, and the molten steel of the subsequent charge is cast onto it so as to surround the exposed portion of the splicing jig. Therefore, a reliable connection can be obtained between the dummy bar head equipped with a splicing jig and the slab cast on top of the dummy bar head, and there is no risk of accidents such as breakage or breakout when the slab is pulled out. You can work safely without any problems.
With conventional relays, it was necessary to pour the molten steel of the next charge before the top surface of the molten steel of the previous charge had solidified, which caused work delays such as time-consuming opening of the tandate nozzle of the subsequent charge, which caused breakouts, etc. However, with this method, as mentioned above, there is no such risk and work can be continued safely.
さらに本発明の方法で使用する前記環状継ぎ治
具は、既述の如く、1800mm×200mmスラブ用で巾
130mm、短径130mm、長径260mm、肉厚15〜20mmの
鋼製環状小片であり、その2個1組の使用で十分
な安全率が得られ、費用的にきわめて低廉です
み、しかも鋳片の厚みの制軛をうける横径よりも
上下方向の縦径を十分大きくとるようにしたの
で、円形パイプを継ぎ治具として横置きするもの
よりも少ない資材でしかも強く安全な上下鋳片の
接続が得られる長所がある。 Further, as mentioned above, the annular joint jig used in the method of the present invention is for a slab of 1800 mm x 200 mm in width.
It is a small annular piece of steel with a diameter of 130 mm, a minor axis of 130 mm, a major axis of 260 mm, and a wall thickness of 15 to 20 mm.A sufficient safety factor can be obtained by using a pair of these pieces, and the cost is extremely low. Since the vertical diameter in the vertical direction is sufficiently larger than the horizontal diameter, which is subject to thickness restrictions, it is possible to connect the upper and lower slabs with less material and with less material than when using a circular pipe as a joint jig, which is placed horizontally. There are advantages to be gained.
次に第8図は、本法により継足し連続鋳造した
前記供給試鋳片の湯境近辺におけるマクロ介在物
の状況を示すグラフであるが、後のチヤージの鋳
片も湯境から僅かに離れた位置で清浄な鋳片とな
ることが示されている。このように本発明の方法
は、既述第7図の成分混合が回避される点と相俟
つて、鋳片継足し部分の切捨範囲が従来法に較べ
て半減し、切捨クロツプの減少による歩留の向上
も著しいものがある。 Next, Fig. 8 is a graph showing the state of macroscopic inclusions near the melt boundary of the supplied test slab that was continuously cast using this method. It has been shown that a clean slab can be obtained at certain positions. In this way, the method of the present invention, in addition to the fact that the mixing of components shown in FIG. There is also a remarkable improvement in yield.
第1図乃至第4図は本発明方法の作業説明図
で、各図のイは縦断正面図、ロは同側面図であ
る。第5図は還状継ぎ治具の一例で、イは正面
図、ロは側面図。第6図は同じく環状継ぎ治具の
他の一例の側面図である。第7図は本法による連
続鋳片の一例について、継足し湯境近辺の成分の
分析試験結果を示す曲線図。第8図は同じく継足
し湯境近辺のマクロ介在物の調査結果を示す曲線
図である。
1:鋳型壁、2:前チヤージの溶鋼、3:継ぎ
治具、ld:同縦径、sd:同横径、4:後チヤージ
の溶鋼、5:冷剤、6:浸漬ノズル。
1 to 4 are explanatory diagrams of the work of the method of the present invention, and in each figure, A is a longitudinal sectional front view, and B is a side view of the same. Fig. 5 shows an example of a circular joint jig, with A being a front view and B being a side view. FIG. 6 is a side view of another example of the annular joint jig. FIG. 7 is a curve diagram showing the analysis test results of components near the replenishment boundary for an example of a continuous slab produced by this method. FIG. 8 is a curve diagram showing the results of an investigation of macroscopic inclusions in the vicinity of the additional hot water boundary. 1: mold wall, 2: molten steel from front charge, 3: splicing jig, ld: same longitudinal diameter, sd: same horizontal diameter, 4: molten steel from after charge, 5: coolant, 6: immersion nozzle.
Claims (1)
一たん停止し、鋳型内に湯面に縦を長径ld、横を
短径sdとした楕円もしくは異形環状の継ぎ治具
を複数個、鋳型の巾方向へ環軸を揃え適当間隔を
おいて且つ継ぎ治具の環の長径ldの略々半が湯面
下に没するように配置すると共に、鋳型内の湯面
に冷剤を投入して表面を凝固させ、その上へ次の
チヤージのタンデイツシユからの溶鋼の鋳込を再
開することを特徴とする鋼の継足し連続鋳造方
法。1. Temporarily stop pouring from the previous charge tundish, and place multiple elliptical or irregularly shaped joint jigs with the major axis ld vertically and the minor axis sd horizontally on the surface of the mold in the width direction of the mold. Align the ring axes of the splicing jig and place it at appropriate intervals so that approximately half of the major axis ld of the ring is submerged below the molten metal surface, and coolant is poured into the molten metal surface in the mold to cool the surface. A method for continuous continuous casting of steel, characterized by solidifying the steel and restarting the pouring of molten steel from the next charge tundish onto the solidified steel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11498678A JPS5542145A (en) | 1978-09-18 | 1978-09-18 | Additional pouring continuous casting method of steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11498678A JPS5542145A (en) | 1978-09-18 | 1978-09-18 | Additional pouring continuous casting method of steel |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5542145A JPS5542145A (en) | 1980-03-25 |
JPS6132105B2 true JPS6132105B2 (en) | 1986-07-24 |
Family
ID=14651509
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11498678A Granted JPS5542145A (en) | 1978-09-18 | 1978-09-18 | Additional pouring continuous casting method of steel |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5542145A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20130088841A (en) * | 2010-06-30 | 2013-08-08 | 지멘스 브이에이아이 메탈스 테크놀로지스 게엠베하 | Initial casting part, dummy bar head, and dummy bar for a continuous casting machine for casting preliminary profiles |
CN108067597A (en) * | 2018-02-01 | 2018-05-25 | 河钢股份有限公司承德分公司 | Continuous casting steel machine method |
CN108543920B (en) * | 2018-05-02 | 2019-11-08 | 山东钢铁股份有限公司 | Conticaster and utilize in the continuous casting of the conticaster heat change tundish method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5028429A (en) * | 1973-07-17 | 1975-03-24 | ||
JPS5057921A (en) * | 1973-09-25 | 1975-05-20 |
-
1978
- 1978-09-18 JP JP11498678A patent/JPS5542145A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5028429A (en) * | 1973-07-17 | 1975-03-24 | ||
JPS5057921A (en) * | 1973-09-25 | 1975-05-20 |
Also Published As
Publication number | Publication date |
---|---|
JPS5542145A (en) | 1980-03-25 |
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